Randy Durband, Chief Executive Officer

Randyx-2Randy Durband has had two careers in travel and tourism – twenty-plus years in senior leadership positions at some of the finest U.S. tour operators, having served as President for Travcoa, INTRAV, and Clipper Cruise Lines, (brands within TUI Travel plc), plus Executive Vice President of Tauck World Discovery. Following that, in his second travel and tourism career, Randy advanced the work of Sustainable Tourism as an advisor, consultant, and speaker.  He brings his knowledge of the business of travel, his global network of travel professionals, and a passion for sustainability to support the GSTC and the general sustainable tourism movement. He has held several board positions and committee memberships in travel and tourism organizations, and is a frequent speaker on sustainable tourism issues.

Contact Randy at This email address is being protected from spambots. You need JavaScript enabled to view it.  

Greta Andzenge, Membership & Communications Director

Head shots 105Greta Andzenge's background in marketing, public relations, tourism and sustainable development have led to her role at GSTC.  Greta has been a key member of multiple international travel wholesalers specializing in the Caribbean region, directing international sales, product development, and relationship management. Her work with Marketplace Excellence Corporation has involved varied public relations, communications, strategy and sustainable development roles.  Her passion for promoting sustainable development has extended to non-profit service with the Caribbean Media Exchange (CMEx) supporting local and community development as well as the media.

In addition to a BA in Business Administration from Metropolitan State University, Greta holds a Master of Tourism Administration from The George Washington University School of Business, with a concentration in Sustainable Destination Management. 

Contact Greta at This email address is being protected from spambots. You need JavaScript enabled to view it.

Guy Chester, Technical Director

Guy Chester

Guy Chester has been a member of the GSTC since its inception. He has chaired the accreditation panel during the development of GSTC's accreditation program, served on the GSTC Board of Directors, and was a member of the standards committee during the recent revisions of both standards.  EcoSustainAbility's founder and director, Guy Chester has been involved in sustainable tourism and ecotourism for over twenty five years. Guy was the founding Vice President of Australia's Ecotourism Association and a co-author of the Ecotourism accreditation program. Guy has worked extensively with sustainable tourism certification programs in providing standards development, administrative policy and procedures, training and auditing. Guy has developed highly regarded tourism strategies for Australian icon tourism regions including the Daintree, Port Douglas the Flinders Ranges and the South Australian Outback. He has also undertaken sustainable tourism and ecotourism projects for the World Tourism Organization and the Peoples Republic of China. Guy was the Team Leader for the development of the Fiji Tourism Development Plan 2007-2016. Guy has recently completed nine regional tourism development and tourism product development strategies for the Papua New Guinea government. Guy has was the chair of the Accreditation Committee and has recently served as a member of the Standards Committee and a strong advocate for the GSTC's establishment. Guy is well known internationally as an expert in best practice sustainable development, in particular in ecotourism and infrastructure development in natural areas.

Contact Guy at This email address is being protected from spambots. You need JavaScript enabled to view it. 


Kathleen Pessolano, Destinations Program Director


KP PhotoKathleen Pessolano is Director of the GSTC Destinations Program. She also serves as Associate Technical Director for the GSTC. Kathleen is an attorney and international practitioner at the intersection of tourism and sustainable development. She assists destinations with planning, policy, and management systems to develop tourism while protecting the natural and cultural resources loved by visitors and residents alike. Kathleen especially enjoys working directly with communities to build capacity, devise strategies to broaden community benefits from tourism, and launch public-private governance structures for sustainable destination management. Kathleen is particularly passionate about coastal tourism issues and small island development. In the last decade, Kathleen has worked for the GSTC, The Heritas Group, Cultural Heritage Partners PLLC, Sustainable Travel International, and served as an attorney for the U.S. Federal Trade Commission and the law firm O'Melveny & Myers LLP. Before law school, Kathleen helped the Center for International Private Enterprise advance private sector development in Latin America & the Caribbean.

Contact Kathleen at This email address is being protected from spambots. You need JavaScript enabled to view it. 

Amos Bien, Associate Technical Director


Amos is a population ecologist by academic training and administrator, and works in the field of the sustainability of tourism and standardization. He was the lead consultant in developing the “Global Sustainable Tourism Criteria”, author of the “Tourism Sustainability Scorecard” for the Inter-American Development Bank (IDB), member of the ISO Technical Committee on Tourism, author of the “Guide for Tourism: Instrument for Environmental and Social Management” (IUCN) for the environmental authorities of Central America and the Dominican Republic, and lead consultant for the study “Policy elements for the sustainability of cruise tourism in Central America” (IDB and INCAE). He also recently worked for the United Nations Environmental Programme (UNEP) on sustainable tourism issues, where he coordinated the projects for establishing a Global Sustainable Tourism Partnership and the Sustainable Investment and Finance in Tourism (SIFT) initiative.  He is a founding member of the GSTC and is the founder and CEO of Rara Avis Rainforest Lodge and Reserve, one of the first ecolodges and private reserves in Costa Rica. He has also worked as a university professor, and in business administration, environmental auditing, and construction. He was the founding president of the Costa Rican Private Nature Reserves Association, president of the Costa Rican Youth Hostel Association, treasurer of the Federation of Costa Rican Environmental Organizations, member of the National Biodiversity Commission, and a country representative to the UN Convention on Biological Diversity and the Johannesburg Summit on Sustainable Development.

Contact Amos at This email address is being protected from spambots. You need JavaScript enabled to view it.

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